Method for preparing adhesives from stable butadiene polymer latexes

Abstract

An aqueous composition that includes (A) a butadiene polymer latex that is prepared by an emulsion polymerization in the presence of a styrene sulfonate stabilizer and (B) a phenolic resin. A preferred aqueous butadiene polymer latex is one that is prepared by emulsion polymerization of at least 60 weight percent dichlorobutadiene monomer (based on the amount of total monomers used to form the butadiene polymer), in the presence of a styrene sulfonate stabilizer.

1. A method for preparing an aqueous adhesive composition comprising preparing an aqueous butadiene polymer latex by emulsion polymerization of at least one butadiene monomer in the presence of a stabilizer selected from styrene sulfonic acid, styrene sulfonate, poly(styrene sulfonic acid) or poly(styrene sulfonate) and an anionic surfactant in the absence of a volatile organic compound, and combining the aqueous butadiene polymer latex with an aromatic nitroso compound. 
     
     
       2. The method for preparing an adhesive composition according to  claim 1  wherein the butadiene monomer is selected from 2,3-dichloro-1,3-dimethylbutadiene; chloroprene; bromoprene; 2,3-dibrom-1,3-butadiene; 1,1,2-trichlorobutadiene; cyanoprene; or hexachlorobutadiene. 
     
     
       3. The method for preparing an adhesive composition according to  claim 2  wherein the butadiene monomer comprises 2,3-dichloro-1,3-butadiene. 
     
     
       4. The method for preparing an adhesive composition according to clam  1  wherein the stabilizer comprises poly(styrene sulfonate). 
     
     
       5. The method for preparing an adhesive composition according to  claim 1  wherein the butadiene polymer is prepared by copolymerization of the dichlorobutadiene with at least one copolymerizable monomer. 
     
     
       6. The method for preparing an adhesive composition according to  claim 5  wherein the copolymerizable monomer comprises an α-haloacrylonitrile. 
     
     
       7. The method for preparing an adhesive composition according to  claim 1  wherein the butadiene polymer latex is prepared by emulsion polymerization of at least 60 weight percent dichlorobutadiene monomer, wherein the weight percent is based on the weight of total monomers used to prepare the butadiene polymer. 
     
     
       8. The method for preparing an adhesive according to  claim 1  further comprising adding a dispersion of a phenolic resin and a metal oxide. 
     
     
       9. The method for preparing an adhesive according to  claim 1  wherein said aromatic nitroso compound is an aromatic hydrocarbon containing at least two nitroso groups attached directly to non-adjacent ring carbon atoms. 
     
     
       10. The method for preparing an adhesive according to  claim 9  wherein said aromatic hydrocarbon is selected from benzene, naphthalene, anthracene, and biphenyl. 
     
     
       11. The method for preparing an adhesive according to  claim 1 , wherein said aromatic nitroso compound contains from 1 to 3 aromatic nuclei, including fused aromatic nuclei, and said compound contains from 2 to 6 nitroso groups attached directly to non-adjacent nuclear carbon atoms. 
     
     
       12. The method for preparing an adhesive according to  claim 11  wherein said aromatic nitroso compound is dinitrosobenzene or dinitrosonaphthalene. 
     
     
       13. The method for preparing an adhesive according to  claim 11  wherein said aromatic nitroso compound is selected from meta-dinitrosobenzene, para-dinitrosobenzene, meta-dinitrosonaphthalene and para-dinitrosonaphthalene. 
     
     
       14. The method for preparing an adhesive according to  claim 11  wherein on said aromatic nuclei, nuclear hydrogen atoms are substituted by a group selected from alkyl, alkoxy, cycloalkyl, aryl, aralkyl, alkaryl, arylamine, arylnitroso, amino, and halogen groups. 
     
     
       15. The method for preparing an adhesive according to  claim 1  wherein said aromatic nitroso compound is selected from m-dinitrosobenzene, p-dinitrosobenzene, m-dinitrosonaphthalene, p-dinitrosonaphthalene, 2,5-dinitroso-p-cymene, 2-methyl-1,4-dinitrosobenzene, 2-methyl-5-chloro-1,4-dinitrosobenzene, 2-fluoro-1,4-dinitrosobenzene, 2-methoxy-1-3-dinitrosobenzene, 5-chloro-1,3-dinitrosobenzene, 2-benzyl-1,4-dinitrosobenzene, 2-cyclohexyl-1,4-dinitrosobenzene, and combinations thereof.